A minor but fatal bug crept into v1.13 somehow. The details can be found here:
Ray's Bug Alert Thread
Two bits of text in one file are the culprit. This can be easily repaired if you know what to do. You can get instructions in Ray's thread.
I have also posted The Repaired File
on my site for those who prefer not to take the hands-on method. Unzip that file and save it over the existing one. The file belongs in .\Galactic Civilizations\Data\
You must make this fix to play any game in 1.13, because without the fix, only good civs can get ships above battleships, which would obviously render all neutral and evil civs crippled and unviable.
SG players please fix the bug in your versions, and let me know if you have any problems.
Several players are also reporting a crash problem involving a certain UP event. I'll keep you posted on that as we learn more, or you can tune in to the current bug thread at Stardock.